/** Copyright (c) 2008-2009, Markos Evlogimenos
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * The name of Markos Evlogimenos may be used to endorse or
 *		 promote products derived from this software without specific
 *		 prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

package org.kamimark.java.nio;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInput;
import java.io.OutputStream;
import java.nio.ByteBuffer;

public class ByteBufferTools
{
	public static InputStream newInputStream(final ByteBuffer buf) {
		return new InputStream()
		{
			@Override
			public synchronized int read() throws IOException {
				if (!buf.hasRemaining()) {
					return -1;
				}
				return buf.get();
			}

			@Override
			public synchronized int read(final byte[] bytes, final int off, int len) throws IOException {
				len = Math.min(len, buf.remaining());
				buf.get(bytes, off, len);
				return len;
			}
		};
	}

	public static OutputStream newOutputStream(final ByteBuffer buf) {
		return new OutputStream()
		{
			@Override
			public synchronized void write(final byte[] bytes, final int off, final int len) throws IOException {
				buf.put(bytes, off, len);
			}

			@Override
			public synchronized void write(final int b) throws IOException {
				buf.put((byte) b);
			}
		};
	}

	public static String getString(final ByteBuffer buf) {
		int stringSize = buf.getInt();
		return new String(getBytes(buf, stringSize));
	}

	public static int getByteSize(String str) {
		byte[] bytes = str.getBytes();
		int stringSize = bytes.length;
		return 4 + stringSize * 2; // 2 bytes per char
	}

	public static int put(final ByteBuffer buf, String str) {
		byte[] bytes = str.getBytes();
		int stringSize = bytes.length;
		buf.putInt(stringSize);
		buf.put(str.getBytes());
		return getByteSize(str);
	}

	public static String getFullString(final ByteBuffer buf) {
		return new String(getBytes(buf));
	}

	public static byte[] getBytes(final ByteBuffer buf) {
		return getBytes(buf, buf.remaining());
	}

	public static byte[] getBytes(final ByteBuffer buf, int size) {
		byte[] bytes = new byte[size];
		buf.get(bytes);
		return bytes;
	}

	public static ByteBuffer getByteBuffer(ObjectInput in) throws IOException {
		byte[] bytes = new byte[in.available()];
		in.readFully(bytes);
		return ByteBuffer.wrap(bytes);
	}
}
